#include "stdafx.h"
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <math.h> 
#include <ctype.h> 
#include "MD5.h" 

/* POINTER defines a generic pointer type */ 
typedef unsigned char* POINTER; 

/* UINT2 defines a two byte word */ 
typedef unsigned short int UINT2; 

/* UINT4 defines a four byte word */ 
typedef unsigned long int UINT4; 

#define PROTO_LIST(list) list 

/* MD5 context. */ 
typedef struct _MD5_CTX
{
	UINT4 state[4]; /* state (ABCD) */ 
	UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */ 
	unsigned char buffer[64]; /* input buffer */
} MD5_CTX; 

/* Constants for MD5Transform routine. 
*/ 
#define S11 7 
#define S12 12 
#define S13 17 
#define S14 22 
#define S21 5 
#define S22 9 
#define S23 14 
#define S24 20 
#define S31 4 
#define S32 11 
#define S33 16 
#define S34 23 
#define S41 6 
#define S42 10 
#define S43 15 
#define S44 21 

static unsigned char PADDING[64] =
{
	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
}; 

/* F, G, H and I are basic MD5 functions. 
*/ 
#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 
#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 
#define H(x, y, z) ((x) ^ (y) ^ (z)) 
#define I(x, y, z) ((y) ^ ((x) | (~z))) 

/* ROTATE_LEFT rotates x left n bits. 
*/ 
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 
Rotation is separate from addition to prevent recomputation. 
*/ 
#define FF(a, b, c, d, x, s, ac) { \
	(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac);\
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
	} 
#define GG(a, b, c, d, x, s, ac) { \
	(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
	} 
#define HH(a, b, c, d, x, s, ac) { \
	(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
	} 
#define II(a, b, c, d, x, s, ac) { \
	(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT ((a), (s)); \
	(a) += (b); \
	} 

#define TEST_BLOCK_LEN 1000 
#define TEST_BLOCK_COUNT 1000 

static void MD5Transform PROTO_LIST((UINT4[4], unsigned char [64])); 
static void Encode PROTO_LIST((unsigned char *, UINT4 *, unsigned int)); 
static void Decode PROTO_LIST((UINT4 *, unsigned char *, unsigned int)); 
static void MD5_memcpy PROTO_LIST((POINTER, POINTER, unsigned int)); 
static void MD5_memset PROTO_LIST((POINTER, int, unsigned int)); 
static void MD5Init PROTO_LIST((MD5_CTX *)); 
static void MD5Update PROTO_LIST((MD5_CTX *, unsigned char *, unsigned int)); 
static void MD5Final PROTO_LIST((unsigned char [16], MD5_CTX *)); 
static void MDTimeTrial PROTO_LIST((void)); 
static void StringAddOne PROTO_LIST((char *)); 
static void Encode PROTO_LIST((unsigned char *, UINT4 *, unsigned int)); 
static void Decode PROTO_LIST((UINT4 *, unsigned char *, unsigned int)); 

/* MD5 initialization. Begins an MD5 operation, writing a new context. 
*/ 
static void MD5Init(MD5_CTX* context)
{
	context->count[0] = context->count[1] = 0; 
	/* Load magic initialization constants. 
	*/ 
	context->state[0] = 0x67452301; 
	context->state[1] = 0xefcdab89; 
	context->state[2] = 0x98badcfe; 
	context->state[3] = 0x10325476;
} 

/* MD5 block update operation. Continues an MD5 message-digest 
operation, processing another message block, and updating the 
context. 
*/ 
static void MD5Update(MD5_CTX* context, /* context */ 
					  unsigned char* input, /* input block */ 
					  unsigned int inputLen /* length of input block */)
{
	unsigned int i, index, partLen; 

	/* Compute number of bytes mod 64 */ 
	index = (unsigned int) ((context->count[0] >> 3) & 0x3F); 

	/* Update number of bits */ 
	if ((context->count[0] += ((UINT4) inputLen << 3)) <
		((UINT4) inputLen << 3))
		context->count[1]++; 
	context->count[1] += ((UINT4) inputLen >> 29); 

	partLen = 64 - index; 

	/* Transform as many times as possible. 
	*/ 
	if (inputLen >= partLen)
	{
		MD5_memcpy((POINTER) & context->buffer[index], (POINTER) input,
			partLen); 
		MD5Transform(context->state, context->buffer); 

		for (i = partLen; i + 63 < inputLen; i += 64)
			MD5Transform(context->state, &input[i]); 

		index = 0;
	}
	else
		i = 0; 

	/* Buffer remaining input */ 
	MD5_memcpy((POINTER) & context->buffer[index], (POINTER) & input[i],
		inputLen - i);
} 

/* MD5 finalization. Ends an MD5 message-digest operation, writing the 
the message digest and zeroizing the context. 
*/ 
static void MD5Final(unsigned char digest[16], /* message digest */ 
					 MD5_CTX* context /* context */)
{
	unsigned char bits[8]; 
	unsigned int index, padLen; 

	/* Save number of bits */ 
	Encode(bits, context->count, 8); 

	/* Pad out to 56 mod 64. 
	*/ 
	index = (unsigned int) ((context->count[0] >> 3) & 0x3f); 
	padLen = (index < 56) ? (56 - index) : (120 - index); 
	MD5Update(context, PADDING, padLen); 

	/* Append length (before padding) */ 
	MD5Update(context, bits, 8); 

	/* Store state in digest */ 
	Encode(digest, context->state, 16); 

	/* Zeroize sensitive information. 
	*/ 
	MD5_memset((POINTER) context, 0, sizeof(*context));
} 

/* MD5 basic transformation. Transforms state based on block. 
*/ 
static void MD5Transform(UINT4 state[4], unsigned char block[64])
{
	UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 

	Decode(x, block, 64); 

	/* Round 1 */ 
	FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */ 
	FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */ 
	FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */ 
	FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */ 
	FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */ 
	FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */ 
	FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */ 
	FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */ 
	FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */ 
	FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */ 
	FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 
	FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 
	FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 
	FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 
	FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 
	FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 

	/* Round 2 */ 
	GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */ 
	GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */ 
	GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 
	GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */ 
	GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */ 
	GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 
	GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 
	GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */ 
	GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */ 
	GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 
	GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */ 
	GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */ 
	GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 
	GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */ 
	GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */ 
	GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 

	/* Round 3 */ 
	HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */ 
	HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */ 
	HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 
	HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 
	HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */ 
	HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */ 
	HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */ 
	HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 
	HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 
	HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */ 
	HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */ 
	HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */ 
	HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */ 
	HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 
	HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 
	HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */ 

	/* Round 4 */ 
	II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */ 
	II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */ 
	II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 
	II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */ 
	II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 
	II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */ 
	II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 
	II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */ 
	II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */ 
	II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 
	II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */ 
	II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 
	II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */ 
	II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 
	II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */ 
	II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */ 

	state[0] += a; 
	state[1] += b; 
	state[2] += c; 
	state[3] += d; 

	/* Zeroize sensitive information. 
	*/ 
	MD5_memset((POINTER) x, 0, sizeof(x));
} 

/* Encodes input (UINT4) into output (unsigned char). Assumes len is 
a multiple of 4. 
*/ 
static void Encode(unsigned char* output, UINT4* input, unsigned int len)
{
	unsigned int i, j; 

	for (i = 0, j = 0; j < len; i++, j += 4)
	{
		output[j] = (unsigned char) (input[i] & 0xff); 
		output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff); 
		output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff); 
		output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
	}
} 

/* Decodes input (unsigned char) into output (UINT4). Assumes len is 
a multiple of 4. 
*/ 
static void Decode(UINT4* output, unsigned char* input, unsigned int len)
{
	unsigned int i, j; 

	for (i = 0, j = 0; j < len; i++, j += 4)
		output[i] = ((UINT4) input[j]) |
			(((UINT4) input[j + 1]) << 8) |
			(((UINT4) input[j + 2]) << 16) |
			(((UINT4) input[j + 3]) << 24);
} 

/* Note: Replace "for loop" with standard memcpy if possible. 
*/ 
static void MD5_memcpy(POINTER output, POINTER input, unsigned int len)
{
	unsigned int i; 

	for (i = 0; i < len; i++)
		output[i] = input[i];
} 

/* Note: Replace "for loop" with standard memset if possible. 
*/ 
static void MD5_memset(POINTER output, int value, unsigned int len)
{
	unsigned int i; 

	for (i = 0; i < len; i++)
		((char *) output)[i] = (char) value;
} 

/* Digests a string and prints the result. 
*/ 
char* MD5String(char* string)
{
	MD5_CTX context; 
	unsigned char digest[16]; 
	char output1[34]; 
	static char output[33] =
	{
		0
	}; 
	unsigned int len = (int)strlen(string); 
	int i; 

	MD5Init(&context); 
	MD5Update(&context, (unsigned char *) string, len); 
	MD5Final(digest, &context); 

	for (i = 0; i < 16; i++)
	{
		sprintf(&(output1[2 * i]), "%02x", (unsigned char) digest[i]); 
		sprintf(&(output1[2 * i + 1]), "%02x",
			(unsigned char) (digest[i] << 4));
	} 
	for (i = 0; i < 32; i++)
	{
		output[i] = output1[i];
	} 
	return output;
} 

/* get the string add one. 
*/ 
static void StringAddOne(char* orstring)
{
	unsigned int len; 
	int i, n; 

	len = strlen(orstring); 
	n = len - 1; 
	for (i = n; i >= 0; i--)
	{
		if (orstring[i] == '9')
		{
			orstring[i] = 'A'; 
			break;
		}
		else if (orstring[i] == 'Z')
		{
			orstring[i] = 'a'; 
			break;
		}
		else if (orstring[i] == 'z')
		{
			orstring[i] = '0'; 
			continue;
		}
		else
			orstring[i] += 1; 
		break;
	}
} 

/* check the md5 strings one by one,get the password. 
*/ 
bool MD5Check(char* md5string, char* string)
{
	return strcmp(md5string, MD5String(string)) == 0;
}
